SLSQ-50.8B-70N 50.8 mm Dia. x -69.5 mm FL; Double-Concave Lens Uncoated

The SLSQ-50.8B-70N is a high-quality, double-concave spherical lens offered by OptoSigma. This lens, with a diameter of 50.8 mm, is designed for use in a wide range of optical applications. The lens's base shape is circular, and it features a double-concave design, making it suitable for use as a diverging lens.

The lens has a center thickness of 3 mm and an edge thickness of 13.4 mm, providing excellent structural integrity. The effective focal length (EFL) of this lens is -69.5 mm, and the back focal length (BFL) is -70.5 mm, indicating a strong diverging effect. The radii of curvature for the first and second surfaces are -64.4 mm and 64.4 mm, respectively.

This lens is made from fused silica, a material known for its excellent optical properties, including a high Abbe number and low coefficient of thermal expansion. The material ID for this lens is "fused sil mal-1965", indicating its specific type of fused silica.

The lens is uncoated, which means it does not have any anti-reflective or other coatings. This may be suitable for applications where such coatings are not required or desirable.

According to the vendor's website, this lens is currently in stock, making it readily available for immediate use. The website also provides further technical details and specifications, as well as options for customization.